diff --git a/src/unittests/floating_point.spec.ts b/src/unittests/floating_point.spec.ts
index 4c32e11459af..052ee84bc6d4 100644
--- a/src/unittests/floating_point.spec.ts
+++ b/src/unittests/floating_point.spec.ts
@@ -3647,7 +3647,7 @@ g.test('saturateInterval')
 g.test('signInterval')
   .params(u =>
     u
-      .combine('trait', ['f32', 'f16'] as const)
+      .combine('trait', ['f32', 'f16', 'abstract'] as const)
       .beginSubcases()
       .expandWithParams<ScalarToIntervalCase>(p => {
         const constants = FP[p.trait].constants();
diff --git a/src/webgpu/listing_meta.json b/src/webgpu/listing_meta.json
index 867e33f82d8a..fa57ff978139 100644
--- a/src/webgpu/listing_meta.json
+++ b/src/webgpu/listing_meta.json
@@ -1356,7 +1356,7 @@
   "webgpu:shader,execution,expression,call,builtin,saturate:f32:*": { "subcaseMS": 116.275 },
   "webgpu:shader,execution,expression,call,builtin,select:scalar:*": { "subcaseMS": 6.882 },
   "webgpu:shader,execution,expression,call,builtin,select:vector:*": { "subcaseMS": 7.096 },
-  "webgpu:shader,execution,expression,call,builtin,sign:abstract_float:*": { "subcaseMS": 31.708 },
+  "webgpu:shader,execution,expression,call,builtin,sign:abstract_float:*": { "subcaseMS": 412.925 },
   "webgpu:shader,execution,expression,call,builtin,sign:abstract_int:*": { "subcaseMS": 25.806 },
   "webgpu:shader,execution,expression,call,builtin,sign:f16:*": { "subcaseMS": 25.103 },
   "webgpu:shader,execution,expression,call,builtin,sign:f32:*": { "subcaseMS": 8.188 },
diff --git a/src/webgpu/shader/execution/expression/call/builtin/sign.spec.ts b/src/webgpu/shader/execution/expression/call/builtin/sign.spec.ts
index 454ff48e6edc..a147acf6fb24 100644
--- a/src/webgpu/shader/execution/expression/call/builtin/sign.spec.ts
+++ b/src/webgpu/shader/execution/expression/call/builtin/sign.spec.ts
@@ -9,13 +9,24 @@ Returns the sign of e. Component-wise when T is a vector.
 
 import { makeTestGroup } from '../../../../../../common/framework/test_group.js';
 import { GPUTest } from '../../../../../gpu_test.js';
-import { i32, TypeF32, TypeF16, TypeI32 } from '../../../../../util/conversion.js';
+import {
+  i32,
+  TypeF32,
+  TypeF16,
+  TypeI32,
+  TypeAbstractFloat,
+} from '../../../../../util/conversion.js';
 import { FP } from '../../../../../util/floating_point.js';
-import { fullF32Range, fullF16Range, fullI32Range } from '../../../../../util/math.js';
+import {
+  fullF32Range,
+  fullF16Range,
+  fullI32Range,
+  fullF64Range,
+} from '../../../../../util/math.js';
 import { makeCaseCache } from '../../case_cache.js';
-import { allInputSources, run } from '../../expression.js';
+import { allInputSources, onlyConstInputSource, run } from '../../expression.js';
 
-import { builtin } from './builtin.js';
+import { abstractBuiltin, builtin } from './builtin.js';
 
 export const g = makeTestGroup(GPUTest);
 
@@ -26,6 +37,13 @@ export const d = makeCaseCache('sign', {
   f16: () => {
     return FP.f16.generateScalarToIntervalCases(fullF16Range(), 'unfiltered', FP.f16.signInterval);
   },
+  abstract_float: () => {
+    return FP.abstract.generateScalarToIntervalCases(
+      fullF64Range(),
+      'unfiltered',
+      FP.abstract.signInterval
+    );
+  },
   i32: () =>
     fullI32Range().map(i => {
       const signFunc = (i: number): number => (i < 0 ? -1 : i > 0 ? 1 : 0);
@@ -37,13 +55,18 @@ g.test('abstract_float')
   .specURL('https://www.w3.org/TR/WGSL/#sign-builtin')
   .desc(`abstract float tests`)
   .params(u =>
-    u.combine('inputSource', allInputSources).combine('vectorize', [undefined, 2, 3, 4] as const)
+    u
+      .combine('inputSource', onlyConstInputSource)
+      .combine('vectorize', [undefined, 2, 3, 4] as const)
   )
-  .unimplemented();
+  .fn(async t => {
+    const cases = await d.get('abstract_float');
+    await run(t, abstractBuiltin('sign'), [TypeAbstractFloat], TypeAbstractFloat, t.params, cases);
+  });
 
 g.test('abstract_int')
   .specURL('https://www.w3.org/TR/WGSL/#sign-builtin')
-  .desc(`abstract float tests`)
+  .desc(`abstract int tests`)
   .params(u =>
     u.combine('inputSource', allInputSources).combine('vectorize', [undefined, 2, 3, 4] as const)
   )
diff --git a/src/webgpu/util/floating_point.ts b/src/webgpu/util/floating_point.ts
index e9f6271c323b..4d2f9a324cb5 100644
--- a/src/webgpu/util/floating_point.ts
+++ b/src/webgpu/util/floating_point.ts
@@ -5070,7 +5070,7 @@ class FPAbstractTraits extends FPTraits {
   };
   public readonly roundInterval = this.unimplementedScalarToInterval.bind(this, 'roundInterval');
   public readonly saturateInterval = this.saturateIntervalImpl.bind(this);
-  public readonly signInterval = this.unimplementedScalarToInterval.bind(this, 'signInterval');
+  public readonly signInterval = this.signIntervalImpl.bind(this);
   public readonly sinInterval = this.unimplementedScalarToInterval.bind(this, 'sinInterval');
   public readonly sinhInterval = this.unimplementedScalarToInterval.bind(this, 'sinhInterval');
   public readonly smoothStepInterval = this.unimplementedScalarTripleToInterval.bind(